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meson: define qemu_isa_flags 

Create a separate variable for compiler flags that enable
specific instruction set extensions, so that they can be used with
cc.compiles/cc.links.

Note that -mfpmath=sse is a code generation option but it does not
enable new instructions, therefore I did not make it part of
qemu_isa_flags.

Suggested-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-10-07 10:31:28 +02:00
parent 461a9252e2
commit 6ae8c5382b
1 changed files with 15 additions and 9 deletions
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24
meson.build
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@ -335,6 +335,10 @@ elif host_os == 'windows'
endif
endif
# Choose instruction set (currently x86-only)
qemu_isa_flags = []
# __sync_fetch_and_and requires at least -march=i486. Many toolchains
# use i686 as default anyway, but for those that don't, an explicit
# specification is necessary
@ -351,7 +355,7 @@ if host_arch == 'i386' and not cc.links('''
sfaa(&val);
return val;
}''')
qemu_common_flags = ['-march=i486'] + qemu_common_flags
qemu_isa_flags += ['-march=i486']
endif
# Pick x86-64 baseline version
@ -367,29 +371,31 @@ if host_arch in ['i386', 'x86_64']
else
# present on basically all processors but technically not part of
# x86-64-v1, so only include -mneeded for x86-64 version 2 and above
qemu_common_flags = ['-mcx16'] + qemu_common_flags
qemu_isa_flags += ['-mcx16']
endif
endif
if get_option('x86_version') >= '2'
qemu_common_flags = ['-mpopcnt'] + qemu_common_flags
qemu_common_flags = cc.get_supported_arguments('-mneeded') + qemu_common_flags
qemu_isa_flags += ['-mpopcnt']
qemu_isa_flags += cc.get_supported_arguments('-mneeded')
endif
if get_option('x86_version') >= '3'
qemu_common_flags = ['-mmovbe', '-mabm', '-mbmi', '-mbmi2', '-mfma', '-mf16c'] + qemu_common_flags
qemu_isa_flags += ['-mmovbe', '-mabm', '-mbmi', '-mbmi2', '-mfma', '-mf16c']
endif
# add required vector instruction set (each level implies those below)
if get_option('x86_version') == '1'
qemu_common_flags = ['-msse2'] + qemu_common_flags
qemu_isa_flags += ['-msse2']
elif get_option('x86_version') == '2'
qemu_common_flags = ['-msse4.2'] + qemu_common_flags
qemu_isa_flags += ['-msse4.2']
elif get_option('x86_version') == '3'
qemu_common_flags = ['-mavx2'] + qemu_common_flags
qemu_isa_flags += ['-mavx2']
elif get_option('x86_version') == '4'
qemu_common_flags = ['-mavx512f', '-mavx512bw', '-mavx512cd', '-mavx512dq', '-mavx512vl'] + qemu_common_flags
qemu_isa_flags += ['-mavx512f', '-mavx512bw', '-mavx512cd', '-mavx512dq', '-mavx512vl']
endif
endif
qemu_common_flags = qemu_isa_flags + qemu_common_flags
if get_option('prefer_static')
qemu_ldflags += get_option('b_pie') ? '-static-pie' : '-static'
endif